Re: Target sim crashes when recording for reverse debugging; find_inferior_ptid returns null

[Andrew Burgess <andrew.burgess@embecosm.com>]

* William Tambe via Gdb <gdb@sourceware.org> [2020-05-16 08:56:20 -0400]:

> ../../iron-toolchain/binutils/gdb/process-stratum-target.c:47:
> internal-error: virtual gdbarch*
> process_stratum_target::thread_architecture(ptid_t): Assertion `inf !=
> NULL' failed.
> 
> Above is the crash that occur after issuing following gdb commands:
> target sim
> load
> record
> si
> 
> The crash occurs because find_inferior_ptid() returns NULL.
> From below backtrace, is it possible to determine what could be the
> cause of find_inferior_ptid() returning NULL ?

I've been running with the patch below in place for doing reverse
debugging on a simulator.

I need to clean this up and get it merged at some point.

Hope this helps,
Thanks,
Andrew


---

commit ecc84c55f926c5a3d7c0dd16b8f46df597ed3f5f
Author: Andrew Burgess <andrew.burgess@embecosm.com>
Date:   Mon Oct 21 21:17:00 2019 +0100

    gdb: Avoid target_thread_architecture
    
    Don't call target_thread_architecture, get gdbarch from regcache
    instead.

diff --git a/gdb/record-full.c b/gdb/record-full.c
index 51b7beabf66..8c83b017b26 100644
--- a/gdb/record-full.c
+++ b/gdb/record-full.c
@@ -1074,9 +1074,10 @@ record_full_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
 
   if (!RECORD_FULL_IS_REPLAY)
     {
-      struct gdbarch *gdbarch = target_thread_architecture (ptid);
+      struct regcache *regcache = get_current_regcache ();
+      struct gdbarch *gdbarch = regcache->arch ();
 
-      record_full_message (get_current_regcache (), signal);
+      record_full_message (regcache, signal);
 
       if (!step)
         {